make enum use consistent by moving it to the header

src/fix_set.cpp

@@ -21,8 +21,6 @@
 using namespace LAMMPS_NS;
 using namespace FixConst;
 
-enum{SETCOMMAND,FIXSET};     // also used in Set class
-
 /* ---------------------------------------------------------------------- */
 
 FixSet::FixSet(LAMMPS *lmp, int narg, char **arg) : Fix(lmp, narg, arg)
@@ -45,7 +43,7 @@ FixSet::FixSet(LAMMPS *lmp, int narg, char **arg) : Fix(lmp, narg, arg)
   // NOTE: could also allow when set style = region,
   //       since atoms may move in/out of regions
 
-  set->process_args(FIXSET,narg-5,&arg[5]);
+  set->process_args(Set::FIXSET, narg-5, &arg[5]);
 }
 
 /* ---------------------------------------------------------------------- */

src/set.cpp

@@ -42,8 +42,6 @@
 using namespace LAMMPS_NS;
 using namespace MathConst;
 
-enum{SETCOMMAND,FIXSET};         // also used in FixSet class
-
 enum{ATOM_SELECT,MOL_SELECT,TYPE_SELECT,GROUP_SELECT,REGION_SELECT};
 
 enum{ANGLE,ANGMOM,APIP_LAMBDA,BOND,CC,CHARGE,DENSITY,DIAMETER,DIHEDRAL,DIPOLE,

src/set.h

@@ -35,6 +35,8 @@ class Set : public Command {
   void selection(int);
   void invoke_actions();
 
+  enum { SETCOMMAND, FIXSET };
+
  private:
   int caller;    // SETCOMMAND or FIXSET